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Frame Relay Questions

August 2nd, 2019 in ROUTE 300-101 Go to comments

Question 1

Explanation

Normal (Ethernet) ARP Request knows the Layer 3 address (IP) and requests for Layer 2 address (MAC). On the other hand, Frame Relay Inverse ARP knows the Layer 2 address (DLCI) and requests for Layer 3 address (IP) so we called it “Inverse”. For detail explanation about Inverse ARP Request please read our Frame Relay tutorial – Part 2.

Question 2

Explanation

When saying “Frame Relay point-to-point” network, it means “Frame Relay subinterfaces” run “point-to-point”. Notice that Frame Relay subinterfaces can run in two modes:
+ Point-to-Point: When a Frame Relay point-to-point subinterface is configured, the subinterface emulates a point-to-point network and OSPF treats it as a point-to-point network type
+ Multipoint: When a Frame Relay multipoint subinterface is configured, OSPF treats this subinterface as an NBMA network type.

And there are 4 network types which can be configured with OSPF. The hello & dead intervals of these types are listed below:

Network Type Hello Interval (secs) Dead Interval (secs)
Point-to-Point 10 40
Point-to-Multipoint 30 120
Broadcast 10 40
Non-Broadcast 30 120

Therefore the default OSPF hello interval on a Frame Relay point-to-point network is 10 seconds.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13693-22.html

Question 3

Explanation

Traffic shaping should be used when:
+ Hub site (headquarter) has much faster speed link than the spokes (remote sites). In this case we need to rate-limit the hub site so that it does not exceed the remote side access rate
+ Hub site has the same speed link as the spokes. For example both the headquarter and the spokes use T1 links. In this case, we need to rate-limit the remote sites so as to not overrun the hub.

An example of configuring traffic shaping is shown below:

interface Serial0/1
encapsulation frame-relay
frame-relay traffic-shaping
!
interface Serial0/1.10 point-to-point
ip address 10.10.10.10 255.255.255.0
frame-relay interface-dlci 10 class my_traffic_shaping
!
map-class frame-relay my_traffic_shaping
frame-relay adaptive-shaping becn //Configure the router to respond to frame relay frames that have the BECN bit set
frame-relay cir 128000 //Specify the committed information rate (CIR) for a Frame Relay virtual circuit
frame-relay bc 8000 //Specify the committed burst size (Bc) for a Frame Relay virtual circuit.
frame-relay be 8000 // Specify the excess burst size (Be) for a Frame Relay virtual circuit.
frame-relay mincir 64000 // Specify minimum acceptable CIR for a Frame Relay virtual circuit.

Reference: http://www.cisco.com/c/en/us/support/docs/wan/frame-relay/6151-traffic-shaping-6151.html

Question 4

Question 5

Question 6

Question 7

Explanation

Each subinterface is treated like a physical interface so split horizon issues are overcome.

Question 8

Explanation

Frame-relay uses data-link connection identifiers (DLCIs) to build up logical circuits. The identifiers have local meaning only, that means that their values are unique per router, but not necessarily in the other routers. For example, there is only one DLCI of 23 representing for the connection from HeadQuarter to Branch 1 and only one DLCI of 51 from HeadQuarter to Branch 2. Branch 1 can use the same DLCI of 23 to represent the connection from it to HeadQuarter. Of course it can use other DLCIs as well because DLCIs are just local significant.

Frame_Relay_DLCI.jpg

By including a DLCI number in the Frame Relay header, HeadQuarter can communicate with both Branch 1 and Branch 2 over the same physical circuit.

Question 9

Explanation

An example of configuring Frame Relay point-to-multipoint connections is described at: http://www.9tut.com/frame-relay-gns3-lab. Frame Relay point-to-multipoint requires inverse ARP (which is enabled by default). It requires the frame-relay mapping command to be configured also. For example: R1(config-if)#frame-relay route 102 interface Serial0/1 201.

Question 10

Explanation

LMI autosense is automatically enabled in the following situations:
+ The router is powered up or the interface changes state to up
+ The line protocol is down but the line is up
+ The interface is a Frame Relay DTE
+ The LMI type is not explicitly configured on the interface

Reference: CCIE Practical Studies: Security

Comments
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    August 3rd, 2017

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    August 18th, 2017

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    August 25th, 2017

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  4. rix
    August 26th, 2017

    Help me

    Got a new Question.

    Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)

    A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
    B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
    C. The device can establish a point-to-point connection to the cloud without a DLCI.
    D. They can operate normally without a DLCI map.
    E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.

    Answer:

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    September 6th, 2017

    Watch out everyone there is new drag and drop on this topic. Its kinda like a sim but it isn’t. Its a full frame-relay network pic with DLCI/PVC, etc. The config of the network is a fill in the blank (your drag and drop) of frame-relay…of where and what commands go where

    I passed today with a 950 for my recert, I believe I got this one right cuz I had been building and trouble-shooting frame-relays for this exam and CCIE on GNS3 for a while…

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  14. CCNP_ROUTE
    March 8th, 2018

    @ Rick

    Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)

    A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
    B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
    C. The device can establish a point-to-point connection to the cloud without a DLCI.
    D. They can operate normally without a DLCI map.
    E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.

    Answer:A, B

  15. chuks
    March 26th, 2018

    why do you think its A and B and not A and D.

    You don’t necessarily need a DLCI map, with inverse ARP dlci will be obtained automatically.

    so why not A and D, except you are just quoting dumps and don’t understand what you are quoting.

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  17. student
    May 29th, 2018

    Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)

    A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
    B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
    C. The device can establish a point-to-point connection to the cloud without a DLCI.
    D. They can operate normally without a DLCI map.
    E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.

    my answer is A&D

    “On point-to-point subinterfaces, you do not need to use the frame-relay map command to perform static address mapping, because it is always assumed that the end point of the point-to-point connection automatically resides on the same subnet as the start point. It is also not required to enable or disable Inverse ARP, because there is only a single remote destination on a point-to-point PVC and discovery is not necessary.”

    http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=6

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  21. BigDave
    August 17th, 2018

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  24. LT
    September 6th, 2018

    Failed with 690.
    Many questions on Frame Relay.
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  28. Dany1
    October 31st, 2018

    I agree with student regarding answers to
    Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)

    A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
    B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
    C. The device can establish a point-to-point connection to the cloud without a DLCI.
    D. They can operate normally without a DLCI map.
    E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.
    A
    “Once you create a specific type of subinterface, you cannot change it without reloading the router. For example, you cannot create a multipoint subinterface serial0.2 and then change it to point-to-point. To change it, you need to either reload the router or create another subinterface. This is the way the Frame Relay code works in Cisco IOS software.”
    http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=5
    D for point-to-point link the following command is used frame-relay interface-dlci xxx where xxx is dlci number assigned to that subinterface.
    Is not used command: frame-relay map ip ip_address dlci_number (that is for point-to-multipoint)

  29. Dany1
    October 31st, 2018

    Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)

    A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
    B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
    C. The device can establish a point-to-point connection to the cloud without a DLCI.
    D. They can operate normally without a DLCI map.
    E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.

    Answers: A & D
    A
    “Once you create a specific type of subinterface, you cannot change it without reloading the router. For example, you cannot create a multipoint subinterface serial0.2 and then change it to point-to-point. To change it, you need to either reload the router or create another subinterface. This is the way the Frame Relay code works in Cisco IOS software.”
    From Cisco Frame Relay Solutions Cisco Press 2004 ( very old)
    D
    For point-to-point configuration command is frame-relay interface-dlci number
    and NOT frame-relay map ip ip_address dlci_number so, is posibile without dlci map
    because is point-to-point link

  30. Dany1
    October 31st, 2018

    How use frame-relay technology in our days???

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